noun
field of application; application domain
Used especially in computing and technical contexts to refer to the area or domain where something is applied.
この技術の適用分野は医療だけではありません。
The field of application for this technology is not limited to medicine.
応用分野 emphasizes practical application or utilization, while 適用分野 focuses on the domain where something is applied or enforced.
Compound of 適用 (application) and 分野 (field, area).